反应详情

To a solution of 1-(3-chloro-2-methyl-4-nitrophenyl)-4-(1-methylethyl)piperazine (12.6 g, 42.4 mmol, 1 equiv) in 120 mL of DMF was added sodium methoxide (1.12 g, 21 mmol, 0.5 equiv) at 0° C. After stirring for 1 hour at room temperature, additional sodium methoxide was added (4.61 g, 85 mmol, 2 equiv, ×2) at 0° C. The mixture was warmed to 35° C. overnight. The next morning, the mixture was diluted with water, dried, and taken to a residue under reduced pressure. Recrystallization from ethyl acetate afforded 1-(1-methylethyl)-4-[2-methyl-3-(methyloxy)-4-nitrophenyl]piperazine (10.8 g, yield 87.1%) of sufficient purity for use in subsequent chemical transformations. 1H NMR (400 MHz, CDCl3) δ ppm 1.12 (d, J=6.53 Hz, 6H), 2.27 (s, 3H), 2.68-2.74 (m, 4H), 2.98-3.09 (m, 4H), 3.89 (s, 3H), 6.78 (d, J=9.2 Hz, 1H), 7.74 (d, J=9.2 Hz, 1H).

1. temperatureThe mixture was warmed to 35° C. overnight
2. customdried
3. customRecrystallization from ethyl acetate